It always amazes me that some drivers seem pretty good on soft slicks but stink on hard slicks or street tires. Rather than learning to drive better, they often become the leaders of the lobby to keep running the soft slicks. We see that regularly with the spec radial used in SCCA.
In terms of setup with the street tires, you need to ignore any inclination to do any tuning before the tire is sliding. You can only do your tuning once the driver is driving hard enough to get the car "dancing" on the tires. It is often a struggle for lessor drivers to get to that point, but once you start tuning for maximum non-sliding grip, it makes the transition to the "dancing" phase that much more difficult. I consider all this to be a "positive" that rewards the best drivers. The really really good ones are able to get their cars "dancing" on the soft slicks!